692 CONTRIBUTIOXS TO NORTH AMERICAN ICHTHYOLOGY — IV. 
1050. I. iiiegaceplialus (Lock.) J. & G. 
Color pale olivaceous with darker cross-bars; fms in the male, black- 
ish; veutrals and anal whitish, unmarked; eye dusky above. Body 
fusiform; head long; eyes large, separated by a very narrow, slightly 
concave interorbital space; mouth large, the maxillary extending to 
posterior border of eye; i>reopercle with a strong process armed 
with 3 or 4 upward-directed and 1 horizontal point; below this 3 other 
spines; two or three spines close behind eye on each side; two occipital 
ridges, ending in spines, the space between them concave; top of head, 
interocular space, snout, upper part of opercle, and a narrow belt close 
under the eye covered with rough scales; lateral line with a series of 
quadrate plates, their upper and posterior edges strongly serrate, the 
lower and anterior edges imbedded; above these the back is evenly cov- 
ered with smaller scales, the lower and anterior part of each scale im- 
bedded, and the upper edge strongly toothed; 5 to 8 rows of these 
scales; a narrow naked area at base of dorsal. Dorsal spines slender, 
the first usually longer than head, reaching past front of soft dorsal 
when depressed ; the second and third spines progressively shortened ; 
the 4th higher than third, the membrane between third and fourth deeply 
emarginate; second dorsal high; pectorals reaching past front of anal; 
ventrals to vent; anal papilla very large; no conspicuous cirri. Head 
2f ; depth 5^. D. III,YII-15; A. 15; V. I, 3; Lat. 1. 38. L. G inches. 
Off San Francisco, in deep water, locally abundant; possibly a variety 
of the next. 
{Chitonotm meyaceplialus Lockington, Proc. U. S. Nat. Mus. 1881, 141.) ^ 
1051. I. psigetfewsis (Steiiul.) J. & G. 
Coloration of the preceding. Body slender, stouter than in I. mef/a- 
cephalus ; head shorter and broader; the mouth also shorter, the maxil- 
lary not reaching posterior margin of eye; interorbital space extremely 
narrow, narrower than in I. megaceplialus ; sqnamation and armature of 
head aud body precisely as in J. megacephalus. Dorsal lower than in I. 
megacephaluSj the first dorsal less deeply notched; the first spine little 
higher than the second, its tip not reaching to the end of the fin, its total 
length less than half that of the head; soft dorsal high, higher than first 
dorsal spine. Head 3; depth 4|. D. Ill, yiI-15; A. 15; Y. I, 3; Lat 1. 
37. L. 6 inches. Puget Sound. 
{Jrtedius pugettensis Steiudachuer, Icktk. Beitriige, v, 133.) 
